Joints and Joints

Joins It is the place where two or more bones join. Some joints, such as those of the skull, are fixed; in them the bones are firmly joined together.

In other joints, called joints, the bones are mobile and allow the skeleton to perform movements.

Ligaments

The bones of a joint are held in place by ligaments, resilient cords made up of fibrous connective tissue. Ligaments are firmly attached to the membranes that line the bones.

Major diseases related to the skeletal system

The table below presents the main problems related to ossification, axial skeleton and joints present in humans.

Disturbance in:	Disease	Feature
Ossification	Rickets	Cause: Vitamin D deficiency. Bones are not so strong due to lack of calcium and phosphorus. Arched legs and malformation of the head, chest and pelvis may occur
	Osteomalacia	Demineralization of bones due to lack of vitamin D. Same effects of rickets.
	Osteomyelitis	Infectious diseases of the bones.
	Osteoporosis	Decreased bone mass. Age-related, but may also occur during pregnancy. It mainly affects the hips, spine, legs and feet.